Course Title:
Agricultural Mechanics and Metal Technologies
Lesson Title:
Visual Inspection of Welds – Weld Certification
TEKS Addressed in Lesson: 130.22 c 9 D http://ritter.tea.state.tx.us/rules/tac/chapter130/index.html
Lesson Objectives. The student will be able to:
1
2
3
identify by sight weld size, alignment, surface contamination, cracks, porosity, and other
surface discontinuities,
examine various welds for specific criteria, and
evaluate welds for quality.
Tools and Equipment
PPE
Appropriate welding machines and electrodes for process
Practice metal or projects in progress
Visual Inspection PPT
Visual Inspection Basics PPT
Key Terms / Vocabulary
Arc Strikes
Blow Hole
Porosity
Lack of Fusion
Lack of Penetration
Weld Spatter
Undercut
Underfill
Weld Size
Cracks
Misalignment
Non-destructive evaluation (NDE) or Non-destructive testing (NDT)
Engage / Interest Approach/Anticipatory Set
Typically, 70% to 80% of surface defects in welds are found and repaired prior to examination by other
NDE methods. Effective visual examination must be performed before, during, and after welding. Use
visual examination to evaluate welds at every stage of the fabrication process.
Show Visual Inspection (VT) PPT at this point.
Explore & Explain / Teaching Plan and Strategy / Presentation of New Material
Show Visual Inspection Basics PPT for this part of lesson.
A. Checklist Before Welding
Review applicable documentation
Check welding procedures
Check welder qualifications
Establish hold points (if required)
Develop Inspection Plan (if required)
Develop plan for recording inspection results
Develop system for identification of rejected welds
Check condition of welding equipment
Check quality and condition of base and filler metals to be used
Check weld preparations
Check weld joint fit-up
Check adequacy of alignment devices
Check pre-heat and calibration of equipment when required
Check gas and gas flow when required
B. Checklist During Welding
Check welding variables for compliance with welding procedure
Check quality of root pass
Check quality of individual weld passes
Check interpass cleaning and temperature
Check placement and sequencing of individual weld passes
Check back gouged surfaces (if required)
Elaborate / Activity/Application/ Student Engagement /Laboratory
Ask students to develop their own Weld Inspection Reports, either singly or in groups.
Ask students to develop their own Non-conformance Reports.
Ask students to count the number of welds made in a particular piece, and calculate personal
Weld Rejection Rates.
Evaluation / Summary
C. Checklist After Welding
Check finished weld appearance
Check weld size and length when required
Check dimensional accuracy of weldments
Monitor in-process NDT (if required)
Monitor post weld heat treatment (if required)
Prepare Inspection Reports (if required)
References/Additional Materials / Extended Learning Opportunities/ Enrichment
ASME Section XI, AWS A3.0
College & Career Readiness Standard
©Texas Education Agency, 2015